A Capuchin father and distinguished physicist, Chérubin d'Orléans (François Lasséré) devoted himself to the study of optics and to vision-related problems, which he discussed in La dioptrique oculaire and La vision parfaite (Paris, 1671 and 1677respectively). He invented the first binocular telescope. He devised and may also have built a special type of eyepiece that replaced the lens with a short tube. Chérubin is also credited with producing models of the eyeball for studying the lens function of the eye.